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Neo4j: The learning to cycle dependency graph


Over the past couple of weeks I’ve been reading about skill building and the break down of skills into more manageable chunks, and recently had a chance to break down the skills required to learn to cycle. I initially sketched out the skill progression but quickly realised I had drawn a dependency graph and thought that putting it into Neo4j ...

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Microservices for Enterprises Part I


Technology is the foundation of differentiation whether you’re a large enterprise or the small startup. If businesses fail to embrace that fact, they run the risk of losing marketshare and ultimately headed for the history books. Providing new services, products, or innovative creativity to improve the experience of existing services all have a foundation in technology and IT can help ...

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Java 8 Lambdas in One Line


If you understand this line, or better still can write this code you can pretty much say that you have understood the essence of Java 8 Lambdas. Certainly in as much as they can be used with collections. I found this in a recent presentation by Peter Lawrey.  (Definitely worth watching the whole presentation when you have a spare hour.) Anyway ...

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Getting Notified About RabbitMQ Cluster Partitioning


If you are running RabbitMQ in a cluster, it is not unlikely that the cluster gets partitioned (part of the cluster losing connection to the rest). The basic commands to show the status and configure the behaviour is explained in the linked page above. And when partitioning happens, you want to first be notified about that, and second – resolve ...

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Alternating between Spray-servlet and Spray-can


On a server you may want to deploy your application as a war. How to build a war with spray-servlet. Locally it’s easiest to run without an application server. We include both the spray-servlet and spray-can dependencies: name := "sprayApiExample" version := "1.0" scalaVersion := "2.11.6" libraryDependencies ++= { val akkaV = "2.3.9" val sprayV = "1.3.3" Seq( "io.spray" %% ...

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5 Ways to Destroy Your Productivity


Hey you. Yeah, you. Want to know how to absolutely and utterly destroy your productivity? Good. You’ve come to the right place. Being productive is overrated. I mean really. What good does it get you? The more work you get done, the more work you get asked to do. So, here are a few quick tips that will help ensure ...

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Spring from the Trenches: Injecting Property Values Into Configuration Beans


Spring Framework has a good support for injecting property values found from properties files into bean or @Configuration classes. However, if we inject individual property values into these classes, we will face some problems. This blog post identifies these problems and describes how we can solve them. Let’s get started. If you use Spring Boot, you should use its typesafe ...

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Biological computer simulation of selfish genes


TL;DR: I did a computer simulation of behavior evolution of monkeys, continue reading to see how problem was stated originally in The Selfish Gene. First part shows my Java implementation, second part shows charted results and conclusions. The problem I read The Selfish Gene by Richard Dawkins recently, very wide-opening book despite being 40 years old. While the original text ...

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